2. Academic Validation
  3. Down-regulation of Hrd1 protects against myocardial ischemia-reperfusion injury by regulating PPARα to prevent oxidative stress, endoplasmic reticulum stress, and cellular apoptosis

Down-regulation of Hrd1 protects against myocardial ischemia-reperfusion injury by regulating PPARα to prevent oxidative stress, endoplasmic reticulum stress, and cellular apoptosis

  • Eur J Pharmacol. 2023 Jun 29;954:175864. doi: 10.1016/j.ejphar.2023.175864.
Boyu Xia 1,  Qi Li 1,  Koulong Zheng 2,  Jingjing Wu 3,  Chao Huang 4,  Kun Liu 1,  Qingsheng You 5,  Xiaomei Yuan 6
Affiliations

Affiliations

  • 1 Department of Cardiothoracic Surgery, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China.
  • 2 Department of Cardiology, The Second Affiliated Hospital of Nantong University, Nantong, Jiangsu, China.
  • 3 Department of Cardiology, Suzhou Kowloon Hospital of Shanghai Jiaotong University School of Medicine, Suzhou, Jiangsu, China.
  • 4 Department of Pharmacology, School of Pharmacy, Nantong University, Nantong, Jiangsu, China.
  • 5 Department of Cardiothoracic Surgery, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China. Electronic address: yqscy@126.com.
  • 6 Department of Cardiology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, Sichuan, China. Electronic address: yuanxiaomei0903@126.com.
PMID: 37392829 DOI: 10.1016/j.ejphar.2023.175864
Abstract

The E3 ubiquitin Ligase HMG-CoA reductase degradation protein 1 (Hrd1) is a key Enzyme for ER-associated degradation of misfolded proteins. Its role in ischemic heart disease has not been fully elucidated. Here, we investigated its effect on oxidative status and cell survival in cardiac ischemia-reperfusion injury (MIRI). We found that virus-induced down-regulation of Hrd1 expression limited infarct size, decreased creatinine kinase (CK) and Lactate Dehydrogenase (LDH), and preserved cardiac function in mice subjected to left anterior descending coronary artery ligation and reperfusion. Silencing of the Hrd1 gene also prevented the ischemia/reperfusion (I/R)-induced (i) increase in dihydroethidium (DHE) intensity, mitochondrial production of Reactive Oxygen Species (ROS), malondialdehyde (MDA), and nitric oxide (NO), (ii) decrease in total antioxidant capacity (T-AOC) and glutathione (GSH), (iii) disruption of mitochondrial membrane potential, and (iv) increase in the expression of glucose-regulated protein 78 (GRP78) and C/EBP homologous protein (CHOP) in ischemic heart tissue. In addition, down-regulation of Hrd1 expression prevented the abnormally increased Caspase-3/caspase-9/Bax expression and decreased Bcl-2 expression in ischemic heart tissue of I/R mice. Further analysis showed that the I/R stimulus reduced peroxisome proliferation activated receptor α (PPARα) expression in ischemic heart tissue, which was partially prevented by down-regulation of Hrd1. Pharmacological inhibition of PPARα was able to abolish the preventive effect of down-regulation of Hrd1 on oxidative stress, endoplasmic reticulum stress, and cellular Apoptosis in ischemic heart tissue. These data suggest that down-regulation of Hrd1 protects the heart from I/R-induced damage by suppressing oxidative stress and cellular Apoptosis likely through PPARα.

Keywords

Apoptosis; Hrd1; MIRI; Oxidative stress; PPARα.

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  • HY-15372
    99.64%, PPAR Antagonist